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工程科学与技术:2012,44(6):61-66
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钢筋网细石混凝土加固受火后预应力混凝土空心板的试验研究
(1.东南大学 建筑设计研究院有限公司;2.上海市建筑科学研究院 上海市工程结构新技术重点实验室;3.华南理工大学 亚热带建筑科学国家重点实验室)
Experimental Research on Fire-damaged PC Hollo-core Slab Strengthened with Steel-meshed Fine Aggregate Concrete
(1.Architects & Engineers Co. LTD,Southeast Univ.;2.Shanghai Key Lab. of New Technol. Research on Eng. Structure,Shanghai Research Inst. of Building Sci.;3.State Key Lab. of Subtropical Building Sci.,South China Univ. of Technol.)
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投稿时间:2012-06-26    修订日期:2012-08-30
中文摘要: 为研究火灾后预制空心板采用钢筋网细石混凝土加固前后的力学性能和破坏形态,对不同受火时间条件下采用钢筋网细石混凝土加固预制空心板的8个试件进行静力试验,其中3个对比未受火未加固试件,1个未受火加固试件,4个分别受火15、30、45和60 min后的加固试件。研究结果表明,钢筋网细石混凝土加固受火预制空心板均发生弯曲破坏;加固能有效抑制试件的开裂,提高弯曲刚度。加固试件的开裂荷载和极限荷载均大幅提高,极限位移有所降低。相同荷载作用下,钢筋网中受压纵筋压应变和孔洞内埋设受拉纵筋拉应变均随受火时间增加而增大。在考虑材料火灾损伤基础上,采用等效截面法计算加固试件的极限承载力是可行的。
Abstract:To study the mechanical properties of fire-damaged prestressed concrete hollow core slabs before and after strengthened with steel-meshed fine aggregate concrete, 8 specimens were experimentally studied by static load tests, which included 3 reference unexposed specimens without strengthening, 1 unexposed specimen with strengthening, 4 fire-damaged specimens strengthened with steel-meshed fine aggregate concrete and exposed 15,30,45 and 60 min, respectively. The test results showed that all the fire-damaged slabs strengthened with steel-meshed fine aggregate concrete collapsed with a bending failure mode, and their bending stiffnesses were increased. The crack strength and the ultimate flexural strength of the strengthened slabs were all obviously increased, and the ultimate deformation was decreased slightly. The predictions of ulitmate flexural strength of strengthened slabs were in close agreement with the test results after taking the fire damage of material into consideration.
文章编号:201200481     中图分类号:    文献标志码:
基金项目:上海市科委应用技术开发项目(2011-114);上海市人才发展资金资助项目(2011058);华南理工大学亚热带建筑科学国家重点实验室开放课题(2010KB12)
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韩重庆,陈振龙,许清风,李向民.钢筋网细石混凝土加固受火后预应力混凝土空心板的试验研究[J].工程科学与技术,2012,44(6):61-66.
Han Chongqing,Chen Zhenlong,Xu Qingfeng,Li Xiangmin.Experimental Research on Fire-damaged PC Hollo-core Slab Strengthened with Steel-meshed Fine Aggregate Concrete[J].Advanced Engineering Sciences,2012,44(6):61-66.